Originally Posted by
Duchess_Driver
True, though it is strongly recommended….
Radio communication and approval of your intentions, or a request for you to do something, like stay above a certain height for example, are strongly recommended, yes. But permission one way or the other does not come into it since it is not controlled airspace.
As for the suggestion of listening squawks - no thanks, since many aircraft do not carry transponders. Letting non transponder equipped aircraft just listen on frequency is a nonsense, since they are allowed in anyway.